2021-03-17 | Technical improvements, changes in design, printing- and other errors reserved.
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4.5. IPv4 TOS/IPv6 TC or DSCP
Instead of 802.1p, setup EOC 20-01/ EoC 20-02 to use the precedence 2 bits of IPv4/v6 DSCP for priority queue
mapping. Be backward compatible with present uses of the IP precedence field of the IPv4 TOS octet or IPv6 TC
byte. The precedence 2 bits in this field (DSCP/TOS/TC) decide the destined priority queue (Q3/Q2/Q1/Q0).
For example:
Bit[7:2] value
TOS/TC field
0x00~0x3C 0x40~0x7C 0x80~0xBC 0xC0~0xFC
Queue
0
1
2
3